<template>
    <el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose"
        :collapse="isCollapse"
        background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b">
        <h3>{{ isCollapse ?  '后台':'后台管理系统' }}</h3>
        <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
            <i :class="`el-icon-${item.icon}`"></i>
            <span slot="title">{{ item.label }}</span>
        </el-menu-item>
        <el-submenu  v-for="item in hasChildren" :key="item.label" :index="item.label">
            <template slot="title">
                <i :class="`el-icon-${item.icon}`"></i>
                <span slot="title">{{ item.label }}</span>
            </template>
            <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
                <el-menu-item  @click="clickMenu(subItem)" :index="subItem.path">{{ subItem.label }}</el-menu-item>
            </el-menu-item-group>
        </el-submenu>
    </el-menu>
</template>

  
<script>
import Cookie from 'js-cookie'

export default {
    data() {
        return {};
    },
    methods: {
        handleOpen(key, keyPath) {
            console.log(key, keyPath);
        },
        handleClose(key, keyPath) {
            console.log(key, keyPath);
        },
        clickMenu(item){
            //console.log(item);
            //当面面的路由不一致时才允许跳转
            if(this.$route.path !== item.path && !(this.$route.path ==='/home' &&(item.path==='/'))){
                this.$router.push(item.path);
            }
            this.$store.commit('selectMenu',item);
        }
    },
    computed:{
        //没有子菜单
        noChildren(){
            return this.menuData.filter(item=>!item.children)
        },
        //有子菜单
        hasChildren(){
            return this.menuData.filter(item=>item.children)
        },
        isCollapse(){
            return this.$store.state.tab.isCollapse;
        },
        menuData(){
        return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu;
        } 
    }
}
</script>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
    width: auto;
    min-height: 400px;
}
.el-menu{
    height: 100vh;
    h3{
        color: #fff;
        font-size: 16px;
        text-align: center;
        line-height: 48px;
        
    }
}
</style>